O`phi·u`ri·oi'de·aO`phi*u*roi'de*a noun plural [ New Latin , from Greek ... serpent + ... tail + ... form.] (Zoology) A class of star-shaped echinoderms having a disklike body, with slender, articulated arms, which are not grooved beneath and are often very fragile; -- cal... Found on http://www.encyclo.co.uk/webster/O/24